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Share-Based Compensation - Unvested HoldCo Units and Class A Common Stock Awards(Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Unvested HoldCo Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested at beginning of period (in shares) 0
Effect of Reorganization Transactions and IPO (in shares) 3,172,843
Granted (in shares) 0
Forfeited (in shares) 0
Vested (in shares) 0
Unvested at June 30, 2018 (in shares) 3,172,843
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Effect of Reorganization Transactions and IPO (in dollars per share) | $ / shares $ 23.00
Unvested at June 30, 2018 (in dollars per share) | $ / shares $ 23.00
Unvested Class A stock awards  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested at beginning of period (in shares) 0
Effect of Reorganization Transactions and IPO (in shares) 255,904
Granted (in shares) 0
Forfeited (in shares) 0
Vested (in shares) (6,696)
Unvested at June 30, 2018 (in shares) 249,208
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Effect of Reorganization Transactions and IPO (in dollars per share) | $ / shares $ 23.00
Vested (in dollars per share) | $ / shares 23.00
Unvested at June 30, 2018 (in dollars per share) | $ / shares $ 23.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Vested in period, fair value | $ $ 154